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Industrial Statistics with Minitab by Xavier Tort-Martorell Llabres, Lluis Marco Almagro, Pere Grima Cintas

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17.1 File ‘MUFFIN’

A local bakery decides to commercialize their famous raspberries muffins through a chain of supermarkets. This requires industrializing the baking process. Their first attempts are unsuccessful due to excessive variability in the height of the muffins. A data collection is organized to try to find the main source of variability. Every hour, three consecutive trays (each having four muffins) are taken from the process, and the height of the four muffins is measured.
nc17uf001.eps
File MUFFIN.MTW contains the data, and is organized as follows:
Column Name Contents
C1 Time Time when the sample was taken
C2 Tray Number of tray
C3 Position Muffin location on the tray (top left, bottom left, top right, bottom right).
C4 Height Muffin height

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